Cleaning and degreasing equipment for complex cavity

Abstract

The application discloses a complex cavity internal cleaning and oil removing equipment, comprising a plurality of vacuum gas collecting pipes, one end of each vacuum gas collecting pipe being connected with one end of a plurality of vacuum pipes, the other end of each vacuum gas collecting pipe being connected with a vacuum pump assembly, each vacuum pump assembly being connected with a vacuum exhaust pipe, the other end of each vacuum pipe being connected with a vacuum heat blowing and removing common pipe, and one end of the vacuum heat blowing and removing common pipe being connected with a heat blowing and removing system. The system solves the problems of incomplete cleaning and low cleaning efficiency of residual fuel in the existing complex cavity.

Description

Technical Field

[0001] This invention belongs to the field of cavity cleaning technology, specifically relating to equipment for cleaning and degreasing the interior of complex cavities. Background Technology

[0002] Equipment with complex cavities or piping systems (such as aircraft and aerospace engines) often retains a significant amount of fuel within its interior after commissioning. This fuel must be completely removed before product delivery. Previously, the conventional method for cleaning residual fuel or excess liquid was the pouring method, which involved using a clamping mechanism to swing the entire product to different positions, allowing the fuel to flow out naturally from the inlet or outlet under gravity. However, due to the intricate cavities and piping of the products, with numerous dead zones, no matter how the product is swung, it is impossible to completely remove the residual fuel, making thorough cleaning a very difficult problem.

[0003] In order to completely remove fuel, in addition to the above-mentioned dumping method, the conventional method is the settling method, which takes advantage of the volatility of fuel to make it vaporize and flow out. Although it has a certain effect, it is inefficient, time-consuming, and still cannot completely clean up the fuel residue in some complex structures. Summary of the Invention

[0004] The purpose of this invention is to provide a cleaning and oil removal device for the interior of complex cavities, which solves the problems of incomplete cleaning of residual fuel and low cleaning efficiency in existing complex cavities.

[0005] The technical solution adopted in this invention is a complex cavity internal cleaning and oil removal device, including several vacuum gas collection pipes, one end of each vacuum gas collection pipe is connected to one end of several vacuum pipelines, the other end of each vacuum gas collection pipe is connected to a vacuum pump assembly, each vacuum pump assembly is connected to a vacuum exhaust pipeline, the other end of each vacuum pipeline is connected to a shared vacuuming and hot blowing pipeline, and the end of the shared vacuuming and hot blowing pipeline connected to the vacuum pipeline is connected to a hot blowing system.

[0006] The invention is further characterized in that,

[0007] Each vacuum line is equipped with a vacuum pneumatic shut-off valve.

[0008] Each vacuum pump assembly includes a bellows and a vacuum gauge. One end of the bellows is connected to the vacuum collection pipe, and the other end is connected to the vacuum exhaust pipe. The bellows is equipped with a vacuum valve, a shut-off valve, a mechanical pump, and a filter in sequence according to the gas flow direction. The vacuum gauge is connected to the vacuum pipe.

[0009] A Roots pump is installed between the vacuum valve and the shut-off valve.

[0010] The hot purging system includes several hot purging gas collection pipes. One end of each hot purging gas collection pipe is connected to several hot purging pipelines. Each hot purging pipeline is equipped with a high-pressure pneumatic shut-off valve I. The end of each hot purging pipeline away from the hot purging gas collection pipe is connected to a shared pipeline for vacuum hot purging. The other end of each hot purging gas collection pipe is connected to a nitrogen pressure regulating and heating component. The nitrogen pressure regulating and heating component is connected to a gas source inlet gas collection pipe. The gas source inlet gas collection pipe is equipped with a vent valve and an inlet valve.

[0011] Each nitrogen pressure regulating and heating assembly includes a pipeline. One end of the pipeline is connected to the hot purge gas collection pipe, and the other end of the pipeline is connected to the gas source inlet gas collection pipe. The pipeline is equipped with a manual shut-off valve, an electronic pressure regulating valve, and a heater in sequence according to the gas inlet direction. A temperature transmitter is installed on the heater. A safety valve is connected in parallel between the electronic pressure regulating valve and the heater. The gas inlet end of the manual shut-off valve is connected to one end of the manual shut-off valve I, and the other end of the manual shut-off valve I is connected to a pressure gauge.

[0012] Each vacuum hot blower common pipeline is equipped with a precision filter, and the end of each vacuum hot blower common pipeline away from the vacuum pipeline is connected to one end of metal hose I via adapter I.

[0013] At least one of the shared pipelines for vacuuming and hot blowing corresponding to each hot blowing gas collection pipe is equipped with a temperature and pressure transmitter.

[0014] It also includes a gas emission pipeline collection pipe, one end of which is connected to several emission pipelines. The end of each emission pipeline away from the gas emission pipeline collection pipe is connected to one end of a metal hose II via an adapter II. An exhaust valve is installed at the other end of the gas emission pipeline collection pipe, and a high-pressure pneumatic shut-off valve II is installed on each emission pipeline.

[0015] The beneficial effects of this invention are:

[0016] (1) The complex cavity cleaning and oil removal equipment of the present invention actively removes residual oil in the complex cavity of the product by means of vacuuming and hot blowing, which greatly improves the cleaning efficiency and effectively solves the problem that dead corners cannot be effectively cleaned. The cleaning effect on the dead corner area of ​​complex cavity is very ideal.

[0017] (2) The complex cavity cleaning and oil removal equipment of the present invention, by setting up multiple vacuum pump components and nitrogen pressure regulating heating components, can work independently of each other, and can simultaneously clean different and non-communicating areas of the complex cavity of the product, and can control different areas to use different pressures and vacuum degrees for cleaning, so as to ensure ideal cleaning effect. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the complex cavity internal cleaning and oil removal equipment of the present invention;

[0019] Figure 2 This is a flowchart illustrating the process of the complex cavity internal cleaning and oil removal equipment of the present invention.

[0020] In the diagram, 1. Vacuum pipeline, 2. Vacuum pneumatic shut-off valve, 3. Vacuum manifold, 4. Vacuum pump assembly, 5. Vacuum exhaust pipeline, 6. Nitrogen pressure regulating and heating assembly, 7. Gas source inlet manifold, 8. Hot blow-off manifold, 9. High-pressure pneumatic shut-off valve I, 10. Common pipeline for vacuuming and hot blow-off, 11. Gas exhaust pipeline manifold, 12. Exhaust pipeline, 13. Adapter I, 14. Metal hose I, 15. Temperature and pressure transmitter, 16. Precision filter, 17. High-pressure pneumatic shut-off valve II, 18. Adapter II, 19. Metal hose II, 20. Hot blow-off pipeline, 21. Venting valve, 22. Inlet valve, 23. Exhaust valve;

[0021] 41. Bellows; 42. Vacuum valve; 43. Shut-off valve; 44. Mechanical pump; 45. Filter; 46. Vacuum gauge; 47. Roots pump;

[0022] 61. Heater, 62. Electronic pressure regulating valve, 63. Manual shut-off valve, 64. Safety valve, 65. Temperature transmitter, 66. Pressure gauge, 67. Manual shut-off valve I, 68. Piping. Detailed Implementation

[0023] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0024] Example 1

[0025] This invention relates to a complex cavity internal cleaning and oil removal device, the structure of which is as follows: Figure 1As shown, the system includes a vacuum system for evacuating the mold cavity. The vacuum system comprises several vacuum collection pipes 3, one end of which is connected to one end of several vacuum lines 1. Each vacuum line 1 is equipped with a vacuum pneumatic shut-off valve 2. The other end of each vacuum collection pipe 3 is connected to a vacuum pump assembly 4. There are three sets of vacuum pump assemblies 4 connected in parallel, allowing them to operate individually or simultaneously. When multiple pump sets operate simultaneously, they can be used to evacuate isolated areas within a complex mold cavity with varying vacuum requirements. Simultaneous vacuuming operation: Each vacuum pump assembly 4 is connected to a vacuum exhaust pipe 5, and the other end of each vacuum pipe 1 is connected to a shared vacuuming and hot blowing pipe 10. One end of the shared vacuuming and hot blowing pipe 10 is connected to the vacuum pipe 1, which is then connected to a hot blowing system. By setting up the shared vacuuming and hot blowing pipe 10, both the vacuum pipe and the hot blowing pipe can be simultaneously connected to the product to be cleaned. Each shared vacuuming and hot blowing pipe 10 is equipped with a precision filter 16, which uses a 5μm metal mesh filter to ensure that the hot nitrogen blown into the product's inner cavity is clean and does not... To prevent the introduction of foreign matter, one end of each vacuum hot-blowing common pipeline 10, away from the vacuum pipeline 1, is connected to one end of a metal hose I14 via an adapter I13. The other end of the metal hose I14 is connected to the cavity. At least one of the several vacuum hot-blowing common pipelines 10 corresponding to each hot-blowing gas collection pipe 8 is equipped with a temperature and pressure transmitter 15. The temperature and pressure transmitter 15 is used to collect the temperature and dynamic pressure of the gas in the pipeline in real time during the hot-blowing process to ensure that the actual values ​​are controlled within a predetermined range. The system also includes a discharge pipeline system, which includes a gas discharge pipeline and a gas collection pipe. 11. One end of the gas emission pipeline collection pipe 11 is connected to several emission pipelines 12. The end of each emission pipeline 12 away from the gas emission pipeline collection pipe 11 is connected to one end of the metal hose II19 through an adapter II18. The other end of the gas emission pipeline collection pipe 11 is equipped with an exhaust valve 23. Each emission pipeline 12 is equipped with a high-pressure pneumatic shut-off valve II17. The other end of the metal hose II19 is connected to the cavity, so as to realize the smooth discharge of hot nitrogen blown into the inner cavity of the product. The emission pipelines 12 of each pipeline are collected on the gas emission pipeline collection pipe 11 and finally discharged to the outside.

[0026] Example 2

[0027] Based on Embodiment 1, each vacuum pump assembly 4 includes a bellows 41 and a vacuum gauge 46. One end of the bellows 41 is connected to the vacuum gas collection pipe 3, and the other end of the bellows 41 is connected to the vacuum exhaust pipe 5. A vacuum valve 42, a shut-off valve 43, a mechanical pump 44, and a filter 45 are sequentially arranged on the bellows 41 according to the gas flow direction. The vacuum gauge 46 is connected to the vacuum pipe 1. A Roots pump 47 is arranged between the vacuum valve 42 and the shut-off valve 43 in at least one vacuum pump assembly 4. By setting the Roots pump 47, different vacuum level requirements can be met.

[0028] Example 3

[0029] Based on Example 2, the hot purging system includes several hot purging gas collection pipes 8. One end of each hot purging gas collection pipe 8 is connected to several hot purging pipelines 20. Each hot purging pipeline 20 is equipped with a high-pressure pneumatic shut-off valve I9. The end of each hot purging pipeline 20 away from the hot purging gas collection pipe 8 is connected to a vacuum hot purging common pipeline 10. The other end of each hot purging gas collection pipe 8 is connected to a nitrogen pressure regulating heating component 6. The nitrogen pressure regulating heating component 6 is set in 3 groups. The 3 groups of nitrogen pressure regulating heating components 6 are set in parallel, so they can work individually or multiple groups can work simultaneously. When multiple sets work simultaneously, they can perform simultaneous hot purging operations on areas that are isolated inside complex cavities and have different hot purging pressure requirements. The nitrogen pressure regulating heating component 6 is connected to a gas source inlet gas collection pipe 7. The gas source inlet gas collection pipe 7 is equipped with a vent valve 21 and an inlet valve 22.

[0030] Each nitrogen pressure regulating and heating assembly 6 includes a pipeline 68, one end of which is connected to the hot blow-out gas collection pipe 8, and the other end of which is connected to the gas source inlet gas collection pipe 7. The pipeline 68 is provided with a manual shut-off valve 63, an electronic pressure regulating valve 62, and a heater 61 in sequence according to the gas inlet direction. A temperature transmitter 65 is provided on the heater 61. A safety valve 64 is connected in parallel between the electronic pressure regulating valve 62 and the heater 61. The gas inlet end of the manual shut-off valve 63 is connected to one end of the manual shut-off valve 67, and the other end of the manual shut-off valve 67 is connected to a pressure gauge 66.

[0031] Among them, the number of vacuum pipeline 1, vacuuming and hot blowing common pipeline 10, and hot blowing pipeline 20 are the same and correspond one-to-one.

[0032] like Figure 2 As shown, the working process of the complex cavity internal cleaning and degreasing equipment of the present invention is as follows: The present invention has the ability to clean multiple internal cavities, and here we take three internal cavities as an example for explanation:

[0033] The main technical specifications of the equipment of this invention are as follows:

[0034] (1) Nitrogen source pressure: ≥1.5MPa;

[0035] (2) Hot nitrogen temperature range: 50~100℃;

[0036] (3) Maximum hot nitrogen purging pressure: ≥1.2 MPa, pressure adjustable;

[0037] (4) The ultimate vacuum of the vacuum pump can reach ≤0.5Pa;

[0038] (5) Equipment capability requirements:

[0039] Internal cavity name vacuum degree Blow-out pressure Inner cavity one ≤30Pa 0.9±0.1MPa Inner cavity two ≤10Pa 0.6±0.1MPa Inner cavity three ≤1Pa 0.4±0.1MPa

[0040] Internal cavity pressure gradient requirements: During the cleaning process, the pressure gradients in cavities one, two, and three must strictly meet P. 一 >P 二 >P 三 ;

[0041] (6) Filter accuracy: 5μm;

[0042] (7) Permissible hydrocarbon content after cleaning the product's internal cavity:

[0043] The inner cavity of the product to be cleaned contains 10 mg / m³ of gaseous hydrocarbons. 3 ;

[0044] The second cavity of the product to be cleaned contains hydrocarbons with a content not exceeding 100 mg / m³. 3 ;

[0045] The hydrocarbon content in the inner cavity of the product to be cleaned should not exceed 500 mg / m³. 3 ;

[0046] The specific process is as follows:

[0047] Step 1: Position and fix the product to be cleaned;

[0048] Step 2, Pipe connection: Connect the metal hoses I14 and II19 to the inner cavity of the product to be cleaned;

[0049] Step 3: Pressurize the entire device of the present invention with positive pressure for leak detection to ensure there are no leaks;

[0050] Step 4: Preheat and blow out the inner cavity of the product to be cleaned: To ensure the cleaning effect and reduce damage to the vacuum pump assembly, the inner cavity of the product must be pre-blown before cleaning. The duration can be set according to process requirements, specifically as follows:

[0051] Step 4.1: Open the high-pressure pneumatic shut-off valve I9 ​​and the high-pressure pneumatic shut-off valve II17;

[0052] Step 4.2, Blowing out the cavity: The gas pressure is controlled within the range of 0.9±0.1MPa by the electronic pressure regulating valve 62 in the nitrogen pressure regulating and heating component 6, and the hot nitrogen temperature is controlled within the range of 50-70℃. After the pressure is built up and stabilized in about 10 minutes, continuous blowing is carried out according to the set time.

[0053] Step 4.3: After the pressure in cavity one stabilizes, hot blowing is performed on cavity two: the gas pressure is controlled within the range of 0.6±0.1MPa by the electronic pressure regulating valve 62 in the nitrogen pressure regulating and heating component 6, and the hot nitrogen temperature is controlled within the range of 50-70℃. After the pressure stabilizes in about 10 minutes, continuous blowing is performed according to the set time.

[0054] Step 4.4 Similarly, after the pressure in cavity two stabilizes, cavity three is hot-blown: the gas pressure is controlled within the range of 0.4±0.1MPa by the electronic pressure regulating valve 62 in the nitrogen pressure regulating and heating component 6, and the hot nitrogen temperature is controlled within the range of 50-70℃. After the pressure stabilizes in about 10 minutes, continuous blowing is carried out according to the set time.

[0055] Step 4.5: After the three cavities have completed the set time of heat blowing treatment, close the high-pressure pneumatic shut-off valve I9 ​​and turn off the heater 61 at the same time. When the pressure inside the product cavity returns to normal pressure, remove the metal hose II19.

[0056] Step 5: Vacuum treatment of the product's inner cavity.

[0057] Step 5.1: Close all valves in the hot air purging system and the discharge piping system;

[0058] Step 5.2, open the vacuum pneumatic shut-off valve 2;

[0059] Step 5.3, perform vacuuming on cavity three: start vacuum pump assembly 4 to evacuate the inner cavity of the product, monitor the current vacuum level of the inner cavity of the product through vacuum gauge, and when it reaches <1Pa, maintain the current vacuum level through vacuum valve 42 in the assembly, and perform continuous vacuuming for the set time.

[0060] Step 5.4, similarly, vacuum treatment is performed on cavities two and one: after the set vacuum level is established in cavity three, the vacuum pump assembly 4 is started to evacuate the inner cavity of the product. The current vacuum level of the inner cavity of the product is monitored by the vacuum gauge. When the vacuum level of cavity two reaches <10Pa and the vacuum level of cavity one reaches <30Pa, the vacuum valve 42 in the assembly is used to maintain the current vacuum level and continuously evacuate the product for the set duration.

[0061] Step 6: Perform heat removal treatment as in Step 4;

[0062] Step 7: After repeating Step 5 and Step 6 three times, keep the product under pressure for half an hour, then let it stand for the set time to allow the very small amount of oil remaining in the product cavity to evaporate naturally.

[0063] Step 8, Sampling and Testing: Take samples from the interior of the product after it has been left to stand for a set period of time to test the hydrocarbon content in the air. By comparing the results with the standard values, determine whether the product has been cleaned properly.

Claims

1. A cleaning and degreasing device for the interior of complex cavities, characterized in that, It includes several vacuum gas collection tubes (3), one end of each vacuum gas collection tube (3) is connected to one end of several vacuum pipelines (1), the other end of each vacuum gas collection tube (3) is connected to a vacuum pump assembly (4), each vacuum pump assembly (4) is connected to a vacuum exhaust pipeline (5), the other end of each vacuum pipeline (1) is connected to a vacuum hot blowing common pipeline (10), and the end of the vacuum hot blowing common pipeline (10) connected to the vacuum pipeline (1) is connected to a hot blowing system; The heat purging system includes several heat purging gas collection pipes (8), one end of each heat purging gas collection pipe (8) is connected to several heat purging pipelines (20), each heat purging pipeline (20) is equipped with a high-pressure pneumatic shut-off valve I (9), the end of each heat purging pipeline (20) away from the heat purging gas collection pipe (8) is connected to a vacuum heat purging common pipeline (10), the other end of each heat purging gas collection pipe (8) is connected to a nitrogen pressure regulating heating component (6), the nitrogen pressure regulating heating component (6) is connected to a gas source inlet gas collection pipe (7), the gas source inlet gas collection pipe (7) is equipped with a vent valve (21) and an inlet valve (22); Each of the nitrogen pressure regulating heating components (6) includes a pipeline (68), one end of which is connected to a hot blow-out gas collection pipe (8), and the other end of which is connected to a gas source inlet gas collection pipe (7). The pipeline (68) is provided with a manual shut-off valve (63), an electronic pressure regulating valve (62), and a heater (61) in sequence according to the gas inlet direction. A temperature transmitter (65) is provided on the heater (61). A safety valve (64) is connected in parallel between the electronic pressure regulating valve (62) and the heater (61). The gas inlet end of the manual shut-off valve (63) is connected to one end of the manual shut-off valve I (67), and the other end of the manual shut-off valve I (67) is connected to a pressure gauge (66). It also includes a gas discharge pipeline collection pipe (11), one end of which is connected to a number of discharge pipes (12). The end of each discharge pipe (12) away from the gas discharge pipeline collection pipe (11) is connected to one end of a metal hose II (19) via an adapter II (18). The other end of the gas discharge pipeline collection pipe (11) is provided with an exhaust valve (23), and each discharge pipe (12) is provided with a high-pressure pneumatic shut-off valve II (17).

2. The complex cavity internal cleaning and degreasing equipment according to claim 1, characterized in that, Each of the vacuum lines (1) is equipped with a vacuum pneumatic shut-off valve (2).

3. The complex cavity internal cleaning and degreasing equipment according to claim 1, characterized in that, Each of the vacuum pump assemblies (4) includes a bellows (41) and a vacuum gauge (46). One end of the bellows (41) is connected to the vacuum gas collection pipe (3), and the other end of the bellows (41) is connected to the vacuum exhaust pipe (5). A vacuum valve (42), a shut-off valve (43), a mechanical pump (44), and a filter (45) are arranged sequentially on the bellows (41) in the direction of gas flow. The vacuum gauge (46) is connected to the vacuum pipe (1).

4. The complex cavity internal cleaning and degreasing equipment according to claim 3, characterized in that, A Roots pump (47) is installed between the vacuum valve (42) and the shut-off valve (43).

5. The complex cavity internal cleaning and degreasing equipment according to claim 1, characterized in that, Each of the vacuuming and hot blowing common pipelines (10) is equipped with a precision filter (16), and one end of each of the vacuuming and hot blowing common pipelines (10) away from the vacuum pipeline (1) is connected to one end of the metal hose I (14) via an adapter I (13).

6. The complex cavity internal cleaning and degreasing equipment according to claim 5, characterized in that, At least one of the several vacuum hot blowing common pipelines (10) corresponding to each of the hot blowing gas collection pipes (8) is equipped with a temperature and pressure transmitter (15).

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